Spec file for RPM builds using COPR

[ECiurleo]

This PR fixes #

Checklist

• [x] I have signed the CLA
• [x] I have updated/added any relevant documentation

Description

What's the goal of this PR?

To make RPMs for Redhat derivative distros.

What changes did you make?

I have created a .spec file to build RPM packages for the various Redhat based distros (Redhat, Amazon Linux, CentOS, Fedora, OpenSuse, Suse)

I created a COPR build job to build the artefacts. https://copr.fedorainfracloud.org/coprs/emanuelec/Pluto/

What alternative solution should we consider, if any?

Happy to assist in moving the COPR build to FairwindOps (rather than my own) for repo based updates or use the Spec file to build RPMs in the current build pipeline for manual downloads.

[CLAassistant]

All committers have signed the CLA.

[ECiurleo]

Is this project still active?

[aslafy-z]

I guess this can be achieved for multiple platforms using https://goreleaser.com/customization/nfpm/. WDYT?